﻿// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Threading;
using Decompiler = ICSharpCode.Decompiler;
using ICSharpCode.ILSpy.Options;

namespace ICSharpCode.ILSpy
{
    /// <summary>
    /// Options passed to the decompiler.
    /// </summary>
    public class DecompilationOptions
    {
        /// <summary>
        /// Gets whether a full decompilation (all members recursively) is desired.
        /// If this option is false, language bindings are allowed to show the only headers of the decompiled element's children.
        /// </summary>
        public bool FullDecompilation { get; set; }

        /// <summary>
        /// Gets/Sets the directory into which the project is saved.
        /// </summary>
        public string SaveAsProjectDirectory { get; set; }

        /// <summary>
        /// Gets the cancellation token that is used to abort the decompiler.
        /// </summary>
        /// <remarks>
        /// Decompilers should regularly call <c>options.CancellationToken.ThrowIfCancellationRequested();</c>
        /// to allow for cooperative cancellation of the decompilation task.
        /// </remarks>
        public CancellationToken CancellationToken { get; set; }

        /// <summary>
        /// Gets the settings for the decompiler.
        /// </summary>
        public Decompiler.DecompilerSettings DecompilerSettings { get; private set; }

        /// <summary>
        /// Gets/sets an optional state of a decompiler text view.
        /// </summary>
        /// <remarks>
        /// This state is used to restore test view's state when decompilation is started by Go Back/Forward action.
        /// </remarks>
        public TextView.DecompilerTextViewState TextViewState { get; set; }

        /// <summary>
        /// Used internally for debugging.
        /// </summary>
        internal int StepLimit = int.MaxValue;
        internal bool IsDebug = false;

        public DecompilationOptions()
            : this(MainWindow.Instance.CurrentLanguageVersion, DecompilerSettingsPanel.CurrentDecompilerSettings, DisplaySettingsPanel.CurrentDisplaySettings)
        {
        }

        public DecompilationOptions(LanguageVersion version)
            : this(version, DecompilerSettingsPanel.CurrentDecompilerSettings, DisplaySettingsPanel.CurrentDisplaySettings)
        {
        }

        public DecompilationOptions(LanguageVersion version, Decompiler.DecompilerSettings settings, Options.DisplaySettings displaySettings)
        {
            if (!Enum.TryParse(version.Version, out Decompiler.CSharp.LanguageVersion languageVersion))
                languageVersion = Decompiler.CSharp.LanguageVersion.Latest;
            var newSettings = this.DecompilerSettings = settings.Clone();
            newSettings.SetLanguageVersion(languageVersion);
            newSettings.ExpandMemberDefinitions = displaySettings.ExpandMemberDefinitions;
            newSettings.ExpandUsingDeclarations = displaySettings.ExpandUsingDeclarations;
            newSettings.FoldBraces = displaySettings.FoldBraces;
            newSettings.ShowDebugInfo = displaySettings.ShowDebugInfo;
            newSettings.CSharpFormattingOptions.IndentationString = GetIndentationString(displaySettings);
        }

        private string GetIndentationString(DisplaySettings displaySettings)
        {
            if (displaySettings.IndentationUseTabs)
            {
                int numberOfTabs = displaySettings.IndentationSize / displaySettings.IndentationTabSize;
                int numberOfSpaces = displaySettings.IndentationSize % displaySettings.IndentationTabSize;
                return new string('\t', numberOfTabs) + new string(' ', numberOfSpaces);
            }
            return new string(' ', displaySettings.IndentationSize);

        }
    }
}